We can solve touch screen problem in N900 Touch by changing touch panel easily.We do jumpers if touch screen connector points are damage or brake, First try to change touch if touch is correct then it is touch ic problem or touch point damage due to water damage.Here i attach a diagram to solve 
nokia n900 touch problem solution diagram
touch screen problem in Nokia N900, observe diagram carefully and do jumpers like diagram below.If touch panel jeck damage then do not jumpers only change touch panel.

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